I've been holding off on getting a tune of while because I'm afraid of damaging the transmission. Is anyone running a tune seeing this issue or any other? I'm considering getting a tune but I am kind of skeptic and nervous about it.

I've been running the 5 star tunes for about a year, and I'm now running a custom tune from National Speed. Only thing I've seen with the tranny thus far, is sometimes after I load a new tune, I'll get a hard shift into third gear. This is while the truck is still learning the new tune / driver.